Telephone hybrid

The Copper 29 digital hybrid, part of the Atomic Range of products, uses a two-pass, twin DSP process, giving a dedicated device-to-echo cancellation, with mix-minus generation. The second DSP takes care of the further processes of the compressor/limiter, automatic gain control (AGC), band pass filters and auto ducking. The result is an audio signal with better than -80dB of separation. A CPLD device is utilized to manage sample rate conversion to remove any unwanted delay, and a voice optimized DAA ensures compatibility with worldwide impedance matching. Auto answer is included as a selectable option, and the inputs and outputs are available as balanced analog or AES3. Due to modern facility control systems, the maximum control level was implemented with 8Vdc loops for control of multiple functions, and full control via RS-232.
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